import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public class Demo06 {

    public static void main(String[] args) throws InterruptedException {
        AtomicInteger atomicInteger = new AtomicInteger();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                atomicInteger.getAndIncrement();
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                atomicInteger.getAndIncrement();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(atomicInteger.get());
    }

}
